BoilerFaultCodesKeston Ignition Lockout Fault Code
Also written as IGNITIONLOCKOUT — same fault.
The Keston Ignition Lockout fault code means: your boiler is failing to light the gas to start the heating and hot water process, likely due to a temporary interruption in the gas supply.. It appears on 7 Keston models in our database.
Technical description: 1 Check other gas appliances - 2 Reset boiler - 3 Contact Installer
DIY fix possible
Check if other gas appliances in your home, like a hob, are working to confirm your gas supply is active.Ensure your gas meter has credit if you are on a prepay system.Press the Reset button on the boiler control panel for 2 seconds.
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Keston models that show the Ignition Lockout fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Keston Ignition Lockout fault code information on this page is sourced and cross-checked against the official Keston service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026